Gusseted bags of the valve type



Aug. 9, 1955 A. PoTDEvlN 2,714,983

GUssETED BAGsVoF THE VALVE TYPE Filed July 50, 1951 Flc. l. Wg

` l l Z FIG. 2. i 4 l FIG. 4.

FIGS.

1N VEN TOR.

ADOLPH POTDEVIIN United States Patent O GUSSETED BAGS F THE VALVE TYPE Adolph Potdevin, Garden City, N. Y., assigner to Potdevin Machine Company, Brooklyn, N. Y., a corporation of New York Application July 30, 1951, Serial No. 239,307

1 lClaim. (Cl. 229-625) This invention is directed to an improvement in bags and more particularly to sleeve valves for gusseted bags.

One of the objects of the invention is to provide a sleeve valve which will present to the material in the bag a very exible, single-ply fold, which will seal much more easily and effectively than the rolled-over conventional sleeve.

Another object of the invention is to provide a construction in which a flexible sealing surface is presented to the material which, by its very nature, prevents sifting of the material between plies.

In the drawings, wherein an embodiment of the invention has been illustrated,

Fig. l is a fragmentary side elevational View of the valve end of a bag blank;

Fig. 2 is an elevational view of the edge of the blank of Fig. l;

Fig. 3 is a View, in part section, similar to Fig. 1, showing the valve tucked and sleeve inserted;

Fig. 4 is an elevational view of the edge of the blank of Fig. 3;

Fig. 5 is a fragmentary side elevational view showing the end of the completed bag; and

Fig. 6 is an elevational view of the edge of the bag of Fig. 5.

Referring to the drawings in detail, 2 designates a gusseted bag blank, the two sides being designated 4 and 6, and the gusset being designated 8.

The blank is multi-ply.

The bag blank at one corner is provided with a projection 10, which is to be tucked to form the valve.

As will be seen from Fig. 3, in tucking or forming the valve, the material of the bag blank at the valve corner is folded over and inwardly of the blank, so that the projection or tab 10 lies within the end of the blank. This provides a valve at the bag corner.

The present invention provides for lining this valve with a sleeve 12. As will be seen from Fig. 3, the sleeve, which projects to the bag interior, extends into the valve,

2,714,983 Patented Aug. 9, 1955 and intermediate its ends the material of the sleeve is folded transversely from edge to edge from the upper side of the valve, as shown at 14, so as not only to line the valve but to extend over or about the valve edge, effectively sealing the valve to prevent passage of the bag contents between the plies of the bag at the valve edge. The sleeve extends along the underside of the valve for a short distance, as illustrated at 16, and is again reversely bent, as seen at 18, and extended a substantial distance beyond the inner edge of the valve to provide a flexible, single-ply sealing extension 20.

A binding strip 22 is finally attached, sewn for example, to the end of the bag and the upper edge of the sleeve 12.

It will be appreciated from all of the foregoing that this invention provides a lined valve for gusseted bags in which the lining sleeve effectively prevents sifting of the bag contents between the bag plies; it will be appreciated furthermore that the invention provides a sleeve extension extending toward the inside of the bag, presenting to the contents of the bag a very flexible sealing element.

What I claim is:

A gusseted bag having one corner folded into the bag to provide a valve at the bag corner; a sleeve for lining the valve, said lining sleeve comprising a sheet which covers the entire interior of the valve, said sheet in one direction extending to the bag exterior forl a substantial distance and in the opposite direction extending to the bag interior for a substantial distance beyond the inner edge of the said valve, said sheet intermediate its ends being folded transversely from edge to edge from the upper side of the valve about the entire inner edge of the valve to the underside of the valve to seal the entire edge of the valve and then folded in the reverse direction transversely of the sheet and from one sheet edge to the other, whereby the said portion of the sheet which extends to the bag interior for a substantial distance beyond the inner edge of the valve lies in a plane which is parallel to but spaced from the plane of the portion of the sheet which extends to the bag exterior; and a binding strip folded over and attached to the bag end and to the upper edges of the lining sleeve.

References Cited in the file of this patent UNITED STATES PATENTS Re. 19,803 Weaver Dec. 31, 1935 1,819,421 Kendall Aug. 18, 1931 2,415,862 Belcher Feb. 18, 1947 2,635,803 Hartman Apr. 21, 1953 FOREIGN PATENTS 808,721 France lIuly 29, 1936 

